string = "他问，你知道cba是什么单词的缩写么  ?   "
print(string)
print('1.删除空格')
print('2.英文标点替换')
print('3.首字母大写')
print('4.退出')
while True:
    option = input("请输入功能选项:\n")
    if option=='1':
        string = string.replace('','')
        print(string)
    elif option =='2':
            for i in string:
                if i ==',':
                    string = string.replace(',','，')
                elif i =='.':
                    string = string.replace('.','。')
                elif i =='?':
                    string = string.replace('?','？')
                elif i =='?':
                    string = string.replace("'","‘")
            string = string
            print(string)
    elif option =='3':
                string = string.upper()
                print(string)
    elif option =='4':
                    break